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Message: <blockquote data-quote="NoSpringChicken" data-source="post: 2068292" data-attributes="member: 53267">Hi Tord. I haven't used the 2.0x converter but I have the 1.4x and I use it all the time with the 50-200 SWD. It brings the lens up to a reasonable focal length for bird photography (although the 2.0x would be even better). It doesn't seem to affect the IQ much, if at all. The only real drawback is that it reduces the maximum aperture by one stop, restricting it to f/4.9 at full zoom. This is less of a problem in summer than in winter.From what I have heard, the 2.0x converter is less successful, as it loses two stops on the aperture and the IQ is, possibly, not quite so good as the 1.4x. The cost is too high for me to take a chance on one, without being reasonably confident of success.You can take a look at my Gallery to see what you think of my photos. Just about all of them have been taken with the 50-200 + EC-14 combination in the past few months. Attached are two recent uploads taken at 283mm and f/4.9. You can also take a look at Cristian Mihai's Gallery, as he used the same combination too most of the time and he is a much better photographer than me.Ron</blockquote>